<article id="wikiArticle">
<div></div>
<h2 id="Summary" name="Summary">概述</h2>
<p><code><strong>Math.cbrt()</strong></code> 函数返回任意数字的立方根.</p>
<h2 id="Syntax" name="Syntax">语法</h2>
<pre><code class="language-javascript">Math.cbrt(<em>x</em>)</code></pre>
<h3 id="Parameters" name="Parameters">参数</h3>
<dl>
<dt><code>x</code></dt>
<dd>任意数字.</dd>
</dl>
<h2 id="Description" name="Description">描述</h2>
<p>该方法为Math的静态方法,因此请直接通过Math.cbrt()方式调用.</p>
<p>参数 <code>x</code> 会被自动类型转换成 <code>number </code>类型.</p>
<p><span style="font-family: 'Courier New','Andale Mono',monospace; font-weight: inherit; line-height: normal;">cbrt 是 "cube root" 的缩写, 意思是立方根.</span></p>
<h2 id="Examples" name="Examples">示例</h2>
<pre><code  class="language-javascript">Math.cbrt(NaN); // NaN
Math.cbrt(-1); // -1
Math.cbrt(-0); // -0
Math.cbrt(-Infinity); // -Infinity
Math.cbrt(0); // 0
Math.cbrt(1); // 1
Math.cbrt(Infinity); // Infinity
Math.cbrt(null); // 0
Math.cbrt(2);  // 1.2599210498948734</code></pre>
<h2 id="Polyfill"><font face="consolas, Liberation Mono, courier, monospace"><span style="background-color: rgba(220, 220, 220, 0.5);">Polyfill</span></font></h2>
<p>为了与旧版浏览器兼容, 可使用下方函数模拟cbrt():</p>
<pre><code class="language-js" dir="rtl">if (!Math.cbrt) {
  Math.cbrt = function(x) {
    var y = Math.pow(Math.abs(x), 1/3);
    return x &lt; 0 ? -y : y;
  };
}</code></pre>
<h2 id="规范">规范</h2>
<table class="standard-table">
<tbody>
<tr>
<th scope="col">Specification</th>
<th scope="col">Status</th>
<th scope="col">Comment</th>
</tr>
<tr>
<td><a class="external" href="https://www.ecma-international.org/ecma-262/6.0/#sec-math.cbrt" hreflang="en" lang="en" rel="noopener">ECMAScript 2015 (6th Edition, ECMA-262)<br/><small lang="zh-CN">Math.cbrt</small></a></td>
<td><span class="spec-Standard">Standard</span></td>
<td>Initial definition.</td>
</tr>
</tbody>
</table>
<h2 id="浏览器兼容性">浏览器兼容性</h2>
<p></p><div class="blockIndicator warning"><strong><a class="external" href="https://github.com/mdn/browser-compat-data" rel="noopener">We're converting our compatibility data into a machine-readable JSON format</a></strong>.
            This compatibility table still uses the old format,
            because we haven't yet converted the data it contains.
            <strong><a class="new" href="/zh-CN/docs/MDN/Contribute/Structures/Compatibility_tables" rel="nofollow">Find out how you can help!</a></strong></div>
<div class="htab">
<a id="AutoCompatibilityTable" name="AutoCompatibilityTable"></a>
<ul>
<li class="selected"><a>Desktop</a></li>
<li><a>Mobile</a></li>
</ul>
</div><p></p>
<div id="compat-desktop">
<table class="compat-table">
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<tr>
<th>Feature</th>
<th>Chrome</th>
<th>Firefox (Gecko)</th>
<th>Internet Explorer</th>
<th>Opera</th>
<th>Safari</th>
</tr>
<tr>
<td>Basic support</td>
<td><span style="color: #f00;">未实现</span></td>
<td><a href="/en-US/Firefox/Releases/25" title="Released on 2013-10-29.">25</a> (25)</td>
<td><span style="color: #f00;">未实现</span></td>
<td><span style="color: #f00;">未实现</span></td>
<td><span style="color: #f00;">未实现</span></td>
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</tbody>
</table>
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<div id="compat-mobile">
<table class="compat-table">
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<tr>
<th>Feature</th>
<th>Android</th>
<th>Chrome for Android</th>
<th>Firefox Mobile (Gecko)</th>
<th>IE Mobile</th>
<th>Opera Mobile</th>
<th>Safari Mobile</th>
</tr>
<tr>
<td>Basic support</td>
<td><span style="color: #f00;">未实现</span></td>
<td><span style="color: #f00;">未实现</span></td>
<td>25.0 (25)</td>
<td><span style="color: #f00;">未实现</span></td>
<td><span style="color: #f00;">未实现</span></td>
<td><span style="color: #f00;">未实现</span></td>
</tr>
</tbody>
</table>
</div>
<p> </p>
<h2 id="另请参见">另请参见</h2>
<ul>
<li><a href="Reference/Global_Objects/Math/pow" title="Math.pow() 函数返回基数（base）的指数（exponent）次幂，即 baseexponent。"><code>Math.pow()</code></a></li>
<li><a href="Reference/Global_Objects/Math/sqrt" title="Math.sqrt() 函数返回一个数的平方根，即："><code>Math.sqrt()</code></a></li>
</ul>
<p> </p>
</article>